/*
* Copyright (c) 1998-2008 Apple Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* The contents of this file constitute Original Code as defined in and
* are subject to the Apple Public Source License Version 1.1 (the
* "License"). You may not use this file except in compliance with the
* License. Please obtain a copy of the License at
* http://www.apple.com/publicsource and read it before using this file.
*
* This Original Code and all software distributed under the License are
* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
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* @APPLE_LICENSE_HEADER_END@
*/
#ifndef_IONETWORKDATA_H
#define_IONETWORKDATA_H
#defineIONetworkParameter IONetworkData // FIXME
/*! @enum NetworkDataAccessTypes
@abstract Constants that describe access types.
@constant kIONetworkDataAccessTypeRead Read access.
@constant kIONetworkDataAccessTypeWrite Write access.
@constant kIONetworkDataAccessTypeReset Reset access.
@constant kIONetworkDataAccessTypeSerialize Serialization access.
*/enum {
kIONetworkDataAccessTypeRead = 0x01,
kIONetworkDataAccessTypeWrite = 0x02,
kIONetworkDataAccessTypeReset = 0x04,
kIONetworkDataAccessTypeSerialize = 0x08,
kIONetworkDataAccessTypeMask = 0xff
};
/*! @define kIONetworkDataBasicAccessTypes
@discussion The default access types supported by an IONetworkData
object. Allow read() and serialize(). */
#definekIONetworkDataBasicAccessTypes \
(kIONetworkDataAccessTypeRead | kIONetworkDataAccessTypeSerialize)
/*! @enum NetworkDataBufferTypes
@abstract The types of data buffers that can be managed by an IONetworkData object.
@constant kIONetworkDataBufferTypeInternal An internal data buffer
allocated by the init() method.
@constant kIONetworkDataBufferTypeExternal An external (persistent) data
buffer.
@constant kIONetworkDataBufferTypeNone No data buffer. The only useful
action perfomed by an IONetworkData object with this buffer type
is to call the access notification handler.
*/enum {
kIONetworkDataBufferTypeInternal = 0,
kIONetworkDataBufferTypeExternal,
kIONetworkDataBufferTypeNone
};
/*! @defined kIONetworkDataBytes
@abstract A property of IONetworkData objects.
@discussion The kIONetworkDataBytes property is an OSData that describes
the data buffer of an IONetworkData object. This property is present
only if kIONetworkDataAccessTypeSerialize access is supported.
*/
#definekIONetworkDataBytes"Data"/*! @defined kIONetworkDataAccessTypes
@abstract A property of IONetworkData objects.
@discussion The kIONetworkDataAccessTypes property is an OSNumber that
describes the supported access types of an IONetworkData object.
*/
#definekIONetworkDataAccessTypes"Access Types"/*! @defined kIONetworkDataSize
@abstract A property of IONetworkData objects.
@discussion The kIONetworkDataSize property is an OSNumber that
describes the size of the data buffer of an IONetworkData object.
*/
#definekIONetworkDataSize"Size"
#ifdefKERNEL
#include<libkern/c++/OSSymbol.h>
#include<libkern/c++/OSSerialize.h>/*! @class IONetworkData
@abstract An object that manages a fixed-size named buffer.
@discussion An IONetworkData object manages a fixed-size named buffer.
This object provides external access methods that can be used to
access the contents of the data buffer. In addition, serialization
is supported, and therefore this object can be added to a property
table to publish the data object. An unique name must be assigned to
the object during initialization. An OSSymbol key will be created
based on the assigned name, and this key can be used when the object
is added to a dictionary.
The level of access granted to the access methods can be restricted,
by specifying a set of supported access types when the object is
initialized, or modified later by calling setAccessTypes(). By default,
each IONetworkData object created will support serialization, and will
also allow its data buffer to be read through the read() access method.
An access notification handler, in the form of a 'C' function, can
be registered to receive a call each time the data buffer is accessed
through an access method. Arguments provided to the handler will identify
the data object and the type of access that triggered the notification.
The handler can therefore perform lazy update of the data buffer until
an interested party tries to read or serialize the data. The notification
handler can also take over the default action performed by the access
methods when the buffer type is set to kIONetworkDataBufferTypeNone.
This will prevent the access methods from accessing the data buffer,
and allow the handler to override the access protocol.
This object is primarily used by IONetworkInterface to export interface
properties to user space.
*/
class IONetworkData : public OSObject
{
OSDeclareDefaultStructors( IONetworkData )
public:
/*! @typedef Action
@abstract Defines a C function that may be called by an IONetworkData object
when one of its access methods is called.
@param target The target of the notification.
@param param A parameter that was provided when the notification
handler was registered.
@param data The IONetworkData object being accessed, and the
sender of the notification.
@param accessType A bit will be set indicating the type of access
which triggered the notification.
@param buffer Pointer to the accessor's buffer. Only valid for
read() and write() accesses.
@param bufferSize Pointer to the size of the accessor's buffer.
@param offset An offset from the start of the data buffer to begin
reading or writing.
*/typedef IOReturn (*Action)(void * target,
void * param,
IONetworkData * data,
UInt32 accessType,
void * buffer,
UInt32 * bufferSize,
UInt32 offset);
protected:
const OSSymbol * _key; // key associated with this object.
UInt32 _access; // supported access types.
void * _buffer; // Data buffer.
UInt32 _bufType; // buffer type
UInt32 _size; // data buffer size.
void * _tapTarget; // target for access notification.
Action _tapAction; // the function to call.
void * _tapParam; // arbitrary notification param.
struct ExpansionData { };
/*! @var reserved
Reserved for future use. (Internal use only) */
ExpansionData * _reserved;
/*! @function free
@abstract Frees the IONetworkData object.
*/
virtual void free();
/*! @function writeBytes
@abstract Writes to the data buffer with data from a source buffer
provided by the caller.
@param srcBuffer Pointer to a source buffer provided by the caller.
@param srcBufferSize The size of the source buffer.
@param writeOffset A byte offset from the start of the data buffer
to begin writting.
@result Returns true if the operation was successful, false otherwise.
*/
virtual bool writeBytes(constvoid * srcBuffer,
UInt32 srcBufferSize,
UInt32 writeOffset = 0);
/*! @function readBytes
@abstract Reads from the data buffer and copies the data to a destination
buffer provided by the caller.
@param dstBuffer Pointer to the destination buffer.
@param dstBufferSize Pointer to an integer containing the size of the
destination buffer. And is overwritten by this method with the actual
number of bytes copied to the destination buffer.
@param readOffset A byte offset from the start of the data buffer
to begin reading.
@result Returns true if the operation was successful, false otherwise.
*/
virtual bool readBytes(void * dstBuffer,
UInt32 * dstBufferSize,
UInt32 readOffset = 0) const;
/*! @function clearBuffer
@abstract Clears the data buffer by filling it with zeroes.
@result Returns true if the operation was successful, false otherwise.
*/
virtual bool clearBuffer();
public:
/*! @function withInternalBuffer
@abstract Factory method that constructs and initializes an
IONetworkData object with an internal data buffer.
@param name A name to assign to this object.
@param bufferSize The number of bytes to allocate for the internal data
buffer.
@param accessTypes The initial supported access types.
@param target The notification target.
@param action The notification action.
@param param A parameter to pass to the notification action.
@result Returns an IONetworkData object on success, or 0 otherwise.
*/static IONetworkData *
withInternalBuffer(constchar * name,
UInt32 bufferSize,
UInt32 accessTypes =
kIONetworkDataBasicAccessTypes,
void * target = 0,
Action action = 0,
void * param = 0);
/*! @function withExternalBuffer
@abstract Factory method that constructs and initializes an
IONetworkData object with an external data buffer.
@param name A name to assign to this object.
@param bufferSize The size of the external data buffer.
@param externalBuffer Pointer to the external data buffer.
@param accessTypes The initial supported access types.
@param target The notification target.
@param action The notification action.
@param param A parameter to pass to the notification action.
@result Returns an IONetworkData object on success, or 0 otherwise.
*/static IONetworkData *
withExternalBuffer(constchar * name,
UInt32 bufferSize,
void * externalBuffer,
UInt32 accessTypes =
kIONetworkDataBasicAccessTypes,
void * target = 0,
Action action = 0,
void * param = 0);
/*! @function withNoBuffer
@abstract Factory method that constructs and initializes an
IONetworkData object without a data buffer.
@discussion The notification handler
must intervene when the IONetworkData is accessed.
@param name A name to assign to this object.
@param bufferSize The size of the phantom data buffer.
@param accessTypes The initial supported access types.
@param target The notification target.
@param action The notification action.
@param param A parameter to pass to the notification action.
@result Returns an IONetworkData object on success, or 0 otherwise.
*/static IONetworkData * withNoBuffer(constchar * name,
UInt32 bufferSize,
UInt32 accessTypes,
void * target,
Action action,
void * param = 0);
/*! @function init
@abstract Initializes an IONetworkData object.
@param name A name to assign to this object.
@param bufferType The type of buffer associated with this object.
@param bufferSize The size of the data buffer.
@param externalBuffer Pointer to an external data buffer.
@param accessTypes The initial supported access types.
Can be later modified by calling setAccessTypes().
@param target The notification target.
@param action The notification action.
@param param A parameter to pass to the notification action.
@result Returns true if initialized successfully, false otherwise.
*/
virtual bool init(constchar * name,
UInt32 bufferType,
UInt32 bufferSize,
void * externalBuffer = 0,
UInt32 accessTypes =
kIONetworkDataBasicAccessTypes,
void * target = 0,
Action action = 0,
void * param = 0);
/*! @function setAccessTypes
@abstract Sets the types of access that are permitted on the data buffer.
@param types A mask of access types indicating the supported access
types.
*/
virtual void setAccessTypes(UInt32 types);
/*! @function setNotificationTarget
@abstract Registers a C function to handle access notifications sent
from this object.
@discussion A notification is sent by an IONetworkData object to the
registered notification handler, when an access method is called to
modify the contents of the data buffer.
@param target The first parameter passed to the notification handler.
@param action A pointer to a C function that will handle the notification.
If 0, then notification is disabled.
@param param An optional parameter passed to the notification handler.
*/
virtual void setNotificationTarget(void * target,
Action action,
void * param = 0);
/*! @function getBuffer
@abstract Gets a pointer to the data buffer.
@result Returns a pointer to the data buffer. Returns 0 if the buffer type is
kIONetworkDataBufferTypeNone.
*/
virtual constvoid * getBuffer() const;
/*! @function getBufferType
@abstract Gets the type of data buffer managed by this object.
@result Returns a constant that describes the type of the data buffer.
*/
virtual UInt32 getBufferType() const;
/*! @function getAccessTypes
@abstract Gets the types of data access supported by this object.
@result Returns a mask of supported access types.
*/
virtual UInt32 getAccessTypes() const;
/*! @function getNotificationTarget
@abstract Gets the first parameter that will be passed to the access
notification handler.
@result Returns the first parameter that will be passed to the access notification
handler.
*/
virtual void * getNotificationTarget() const;
/*! @function getNotificationAction
@abstract Gets the C function that was registered to handle access
notifications sent from this object.
@result Returns a pointer to a C function, or 0 if notification is disabled.
*/
virtual Action getNotificationAction() const;
/*! @function getNotificationParameter
@abstract Gets the parameter that will be passed to the access
notification handler.
@result Returns the parameter that will be passed to the access notification
handler.
*/
virtual void * getNotificationParameter() const;
/*! @function getKey
@abstract Gets a unique OSSymbol key associated with this object.
@discussion During initialization, IONetworkData will create an
OSSymbol key based on its assigned name.
@result Returns an OSSymbol key that was generated from the name assigned to
this object.
*/
virtual const OSSymbol * getKey() const;
/*! @function getSize
@abstract Gets the size of the data buffer.
@result Returns the size of the data buffer managed by this object in bytes.
*/
virtual UInt32 getSize() const;
/*! @function reset
@abstract An access method that resets the data buffer.
@discussion This method handles an external request to reset the data buffer.
If notification is enabled, then the notification handler is called
after the data buffer has been cleared.
@result Returns kIOReturnSuccess on success,
kIOReturnNotWritable if reset access is not permitted,
or an error from the notification handler.
*/
virtual IOReturn reset();
/*! @function read
@abstract An access method that reads from the data buffer.
@discussion This method handles an external request to read from the data buffer
and copy it to the destination buffer provided by the accessor.
If notification is enabled, then the notification handler is called
before the data buffer is copied to the destination buffer. The
notification handler may use this opportunity to intervene and
to update the contents of the data buffer.
@param dstBuffer Pointer to the destination buffer.
@param dstBufferSize Pointer to an integer containing the size of the
destination buffer. And is overwritten by this method to the actual number
of bytes copied to the destination buffer.
@param readOffset An offset from the start of the source data buffer to
begin reading.
@result Returns kIOReturnSuccess on success,
kIOReturnBadArgument if any of the arguments provided is invalid,
kIOReturnNotReadable if read access is not permitted,
or an error from the notification handler.
*/
virtual IOReturn read(void * dstBuffer,
UInt32 * dstBufferSize,
UInt32 readOffset = 0);
/*! @function write
@abstract An access method that writes to the data buffer.
@discussion This method handles an external request to write to the data buffer
from a source buffer provided by the accessor. After checking that
the data object supports write accesses, the data buffer is updated
if it exists. Then the registered notification handler is called.
@param srcBuffer Pointer to the source buffer.
@param srcBufferSize The number of bytes to write to the data buffer.
@param writeOffset An offset from the start of the destination data buffer
to begin writing.
@result Returns kIOReturnSuccess on success,
kIOReturnBadArgument if any of the arguments provided is invalid,
kIOReturnNotWritable if write access is not permitted,
or an error from the notification handler.
*/
virtual IOReturn write(void * srcBuffer,
UInt32 srcBufferSize,
UInt32 writeOffset = 0);
/*! @function serialize
@abstract Serializes the IONetworkData object.
@discussion If notification is enabled, then the notification
handler is called just before the data buffer is serialized.
@param s An OSSerialize object.
@result Returns true on success, false otherwise.
*/
virtual bool serialize(OSSerialize * s) const;
// Virtual function padding
OSMetaClassDeclareReservedUnused( IONetworkData, 0);
OSMetaClassDeclareReservedUnused( IONetworkData, 1);
OSMetaClassDeclareReservedUnused( IONetworkData, 2);
OSMetaClassDeclareReservedUnused( IONetworkData, 3);
};
#endif/* KERNEL */
#endif/* !_IONETWORKDATA_H */